Microbuzzer.com · Posted on 19-07-2010 by microbuzzer

Speaker frequency response curve

Speaker frequency response curve, which is a record in the width of 5cm or lOcm irregular curve of the continuous recording paper.

X-axis represents the input signal frequency of the speaker unit;

Y axis represents the measured loudspeaker signals at different frequencies when the sound pressure level generated.
We the human ear can hear the sound pressure of some magnitude, from the ears just to hear the sound pressure to the ear pain up and down when the sound pressure difference between the nearly 1 million times, so large range of sound pressure sound pressure were measured directly and the comparison is extremely inconvenient. It was found in experiments with L ear to the auditory characteristics of index properties, with exponential size to represent the sound pressure level can be found from the objective of human hearing resolution.

Most of the speaker’s frequency response curve of current measured in the anechoic chamber. The speaker unit is usually measured in the anechoic chamber standard fixed barrier board, measuring microphone placed in the reference axis measured loudspeaker. Most speakers in the 1m · 1W frequency response curve measured under the condition that the measured input signal power of the speaker unit lW, measurement microphone speaker unit measured along the axis from the speaker’s voice reference surface lm. Signal generator’s output signal amplified by power amplifier fed to the speaker under test, the measured radiation from the speaker’s microphone to receive sound signals are measured after the change in electrical signal sent by the measuring amplifier treatment level recorder. When the signal generator’s output signal frequency change, the speaker speaker output sound pressure corresponding changes will occur simultaneously being recorded level recorder, which is the measured frequency response curve of the speaker unit.

Sound pressure level is expressed in decibels (dB), its audio technology is a useful unit of measurement. Sound pressure level of a sound body can be produced by the body sound and effective sound pressure P and the reference sound pressure Pr by multiplying the common logarithm of the ratio of 20 to represent. Where Pr is the reference sound pressure most of the people with normal hearing can hear just the sound frequency of 1000Hz sound when the sound pressure. We usually just hear the sound pressure level of the ear for the OdB, then we feel the deafening sound pressure level when only 140dB, with a logarithmic form shows that the size of the sound pressure level of sound pressure level can be measured and compared to changes very simple.

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